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Debt - Credit Facility (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 13, 2018
Jan. 26, 2018
Dec. 31, 2019
Amended Credit Facility [Member]      
Disclosure of detailed information about borrowings [line items]      
Debt term   4 years  
Upfront lenders fee and transactions cost   $ 793  
Undrawn amount in credit facility     $ 40,000
Amended Credit Facility [Member] | Bottom of range [member] | Ifrs London Interbank Offered Rate (LIBOR) [Member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings, interest rate basis     2.5%
Amended Credit Facility [Member] | Top of range [member] | Ifrs London Interbank Offered Rate (LIBOR) [Member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings, interest rate basis     3.5%
Revolving Credit Facility [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowing capcaity   80,000  
Non-Revolving Credit Facility [Member]      
Disclosure of detailed information about borrowings [line items]      
Borrowing capcaity   $ 40,000  
Third Amendment and Restated Credit Facility [Member]      
Disclosure of detailed information about borrowings [line items]      
Upfront lenders fee and transactions cost $ 545    
Third Amendment and Restated Credit Facility [Member] | Bottom of range [member]      
Disclosure of detailed information about borrowings [line items]      
Additional amount in revolving facility $ 30,000